De laxcy kennedy



De L. KENNEDY. Giilliflg and Cutting Tools.

N -148,566. I Patented Marchl7.18 74.

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Iivii' RGE EivlENT-EPYE GREPING ANS CUTTING TGGLS.

Specification forming part of Letters Patent No. 148,555, dated March 17, 1874; application filed November 4, 1873.

To all ahom it may concern:

Be it known that 1, DE LANGY KENNEDY, of the city, county, and State of New York, have invented an Improved (Jonstrnction of Griping Tools, Punches, Shears, 800., of which the following is a specification:

' tact point of said cams from the straight line between the points of resistance is gradually reduced, and asolid bearing, as contradistinguished from pivotal bearings, is obtained, thus rendering the instrument easier of operation, more powerful, and less liable to wear or fracture.

I will now proceed to describe my invention by reference to the accompanying drawings, which form part of this specification, and in which-- Figure 1 represents a side view of a pairof hand-cuttin g pliers or nippers closed; and, in dotted lines, in the open position of the jaws. Fig. 2 represents a similarly-constructed ap paratus, adapted to have one of its limbs se cured to a bench, or in thejaws ot' a vise, for shearing, punching, or other use requiring more power than the gripe of the hand will atford.

In Fig. 1, A A represent the cuttingdevers, which are pivoted together in the usual manner at a, and to the rearward ends of these levers are pivoted, at b, the hand-levers 13 B, which are provided with inwardly-arrauged eccentriccams c c, which, by the motion of the lovers B B are caused to move around their pivots Z), to which their peripheries are eccentric, and whereby hey have a gradually-ii creasing leverage on the cutting-levers A A, and, being toothed on their peripheries, gear together, and are thus prevented from slippin The axes (l of the peripheries of these cams areconnected by a link, 0, on either side, by which their contact is preserved while the levers B 1; are being separated to open the jaws of the nippers.

In Fig. 2 is represented an instrument, one jaw, K, of which is designed to be secured to a bench, or in thejaws of a vise, or to rest its whole length on a table, the one lever, B, only being movable.

This instrument is practically the same as that before described, except that, owing to the lower lever B being stationary, the lower cam c is pivoted to it at as. Its action, then, in combination with the cam c and links 0, will be precisely the same as that before described and represented in Fig. 1.

By this constructioi'i, the bearing point or contact of the cams is more nearly in, and more gradually approximating to, a straight line between their fulcrums or connecting-points with the levers A A of the cutters than can be obtained with the ordinary toggle-levers, and the resistance is borne by the peripheries of the cams instead of by pins or pivotal connections, which are weak, liable towear,.and consequently inperi'ect in action.

What I claim as new, and desire to secure by Letters Patent, is-

The jaws D, having a common fulcrum, a, and levers A, in combination with the camdevers B B, linked together in the manner described, and pivoted, upon their sides, to the ends of the lovers A, whereby an incrcasedle vcrage is obtained, substantially as set forth.

DIG LANUY KENNEDY.

\Vitnesses:

\VILLIAM E. CARPENTER, Gnusnoar VAN ALLEN. 

